Artificial hand and arm.



L. G. BARON.

A RTIfICIAL HAND AND ARM.

. APPucAnoN men MAR. 12, 1917. T 1 ,247,077. Patented Nov. 20,1917.

2 SHEETS-SHEET I.

JNVENTUR.

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L. G. C'A'RON.

AHTIFICIAL- HAND AND ARM. 7 APPLICATION FILED MAR. l2, r917.

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To all'whomiit n tay wrist me bemlingithehand; a

strufctions 'hei'einhitei dee'c'nbect foreai'tnimembezg;

q .40 I I I i mo i-fi e i n" Figs-'11; a; frqntl ele Y In;-tl1e.- d 1;a- "1ngs 1 enc'eginjdieate conrespondinlg parts 111 ferentufiguresf I I 1i,Referringpartieulaply to l' antl 2, 1 :is v, anunpper amp member; of-prdhiat}: con- Pat-evince of? Ontario,

I specification; 'Thi S in enemy desired-j movements detli visiona'l apyilica'ti'on file No. 166,423 lieation the siiecific deeopenglin g ttpplj cation;

I at 1n Inv 1 1s a pQlSPCCtlIQ view, partly in sec- I :tion of the end of the foreai rn r nemhei i\ vh'ieh Icontafets 'with Fig; e-fronft I ele vatihni partly in section,

ceitoif, moeon'ro, enema ABTIFiCL AL HAND Am 1mm. 1 i v Speeifieetton of Letters Patent.

' ordinary constrnction.

I 'U'nitetl 'Sta'tsf'of Amerioay. in the (iityoffllordto, connty oi- Canada, have 7 No claim isle I seenfecl" to the pulley so .f. 6 .ayperspeetiiie iietailillustrating a Y the]p'nlley actuating the cable for turning the 'Wrist member and (e ,t pun y';

ajfac Vat" i1 of the saine. i

like numeral s'truction and 2 a forearm member also of tional-j'detaiflsiin I kinghe 19 1 luefi e i F g- 6;,

" (The two parts IIOQICANADA.

Patented Nov.-20,31917. 1917. ser'ie1.no.15e,1sa;

my arm intended, to be used where the wearer hate; lost his arm below the elbo\v,joint, no mea s are needed-for bending the forearrn'lmer nber on the upperarmf nember. These members are toget-lgiei'Iv at?) in afl yi oifglinaryfman- .ner;

. s Th -.\1-ist 'end'of the forearm iheniher is finished with a,,.1 nbstantiall v flat nnfece, alndon-nthis enc swiyeled thewnietjinemher A as. lliereinzji it'tet 'ftdeeerihetl', p vitlerl with in @suhstantiel ly flat face to eon vith the endOftheloWer arm memhee;

. The hand 5 is'pivotecl to bend on therist rhelnher, 6 being the pivots.- The fingers, in- ('lmling the. thumb, are each provided with one-o1: more hinge'joint'e 7. to enable them as be flexed. Preferably onejointiis formed in'the thumb Enid two ineaeh of the other fingers;- I a It is desirable that the hand shouhl-pc cnpy;substantially the position-eh pvn in Fig. lwhenzthe arm is extenclecl and that the-hand shonld he turned the Wrist an "bent toward the forearm Whenthe forearm ,is bent on the upper arm asshown. To effect-these moveinents'l proyitte the fol- At oneof the joints 3 -eoncentr.iewitl1 the pivot I "secure n pulley cured to the npher ai-rm' lllglllllclatlliltlll" does not rot-ate relativethereto. Around this pulley is passed a-cflble 9. 'lihisiezible' is also thatht-floes not pin is:-'shoWn move i'ela-tive thereto A for this purpose in'Fig. 8. I

As a vtl rietion 'the'fcable may he formed a sprocket chain, (see Fig. 6') and the pulley 8 as a sjbrocket wheel, 'the 'one arl'alrllgernent being an etia'ct equivalent for the or er. m If of the eable'areled along the" forearm, preferably through" grooves formed in its'shelli Close tofthe WPl'Sl', end of thefforear'm and close to the peiiphery are located two guides 11; which may be of j any forth but are preferably small grooved moi pefer-i 1 the dif{ I rollers get close togethexj. iFfdm these guides the parts of the cable are ledoneto one side and one to the 0ther,and finally pass up groo vee formed at opposite sidsof the rit ,Inembers' and extending in a ,c l'i'ection longitntlinalof theforeai'xh member; I

The ends ofgthecahle Iare eecnredfi espec tively to the fIOtitand back 0f the hand.

056C111? flu t per lad for the parts o'f th "8, which is so selio 30 c tightened up as may be necessary and locked.

cable, I form an annular groove between the I wrist member and the forearm member extending at least half way around the arm. Preferably the groove extends entirely around .the arm and is formed half in the wrist member and half in the fore-arm member as indicated particularly in Figs. 1, 2, 3 and 4. The cable is connected to the pulley I 8 in such a position that when the arm is extended the end of the cable connected to the front of the hand is slacked upand the end "shown in Fig. 1.

connected to the back of the hand is drawn up. The hand thus occupies the position on the upper arm as shown in Fig. 2, the

end of the cable connected to the front of the hand is drawn up, the first result being to twist the wrist member on its swivel joint until the groove l2 in the front of the hand comes in line-with the space between the guides Further bending movement of When the forearm is bent the elbow joint then results in, the hand,

being bent forward on the pivots 6. When the arm is straightened out, the reverse movement takes place. The swivel joint between the wrist member and the fore-arm member is formed by a hollow journal 13 flanged at the wrist membar end and provided with a lock nut at its, opposite end by means of which it may be his gives free rotary movement for the wrist member and at the same time provides passage for the the fingers of the hand.

For operating the lingers I provide cables means for operating been flexed that it shall be possible to retain them in thefle'xed position afterth'e pull on the cable'26 has been relieved. I therefore provide the spring actuated dog 29 movable in the forearm member and adapted to engage the ratchet rack 25. As

the hand turns relative to the forearm'memher the ratchet rack is preferably circular in cross section so that the dog will engage therewith no matter to what position it may be turned on its axis. This dog is actuated normally extended bya coil spring 33. This lever will ordinarily be released by the wearer pressing the upper arm member against his side, thus pressing down on the lever.

F or ordinary purposes and during social intercourse, the hand as described is sufficient, but for actual work and the manipulation of tools better results can be attained by a hand such as shown in Figs. 10 and 11. This hand is bolted to the. wrist mem her as shown, and comprises a fixed member and a hinged member pivoted at'33 on the fixed member. These members are substan 14; which are Secured to a head 15 suitably guided by the guides 16 within the hand, which is hollow. The cables are led around suitably journaled cables and guide rollers are arranged to flex thefingers in 'one direction, preferably to move them to the gripping-position. To

flex them in the reverse direction I provide the cables 18 which pass around suitable guide rollers 19 and are connected with a, head 20 to which is secured a coil spring 21 secured at its other end to the hand. The

thumb is provided with a separate cord 22 and the spring 23.

The head 15 is connected by a flexible member 24 with a ratchet rack 25 adapted to slide in the hollow journal 13 as shown. To the ratchet rack 25 is connected the cable 26. This cable is led. around suitable guides 27 and through the forearm member, terminating preferably in a buckle 28 which may be connected for operation to a shoulder strap as is common in the art. It is evident that by straining on the cable 26 the fingers may be flexed and that on releasing the pulley on the cable, by the springs contained in the hand, the fingers will be returned to normal position.

It is desirable that when the fingers have guide rollers 17. These a short operating 1 40 and passing through a hole in the fixed member.

tially similar inform and each is shaped as an open frame work comprlsing two lon-' gitudinal spaced members 34 and 35 'connected at their ends. A rearwardly facing hook 36 isformcd at the forward end and a forwardly facing hook 37 at the rearward end. The forward ends of the frames are outwardly bent as shown at 38 to facilitate the.

gripping between the members of a cylindrical article'with its axis longitudinal of the length of the hand. The longitudinal members are similarly bent at 39 to facilitate the grasping of a cylindrical article with its axisat right angles to the length of the hand. The inner faces of the members are preferably roughened as shown to prevent slipping.

To operate the movable member I provide arm 40 to which may be connected the, ea c 26. The movable member isoperated in the reverse direction by means ofthe coil spring 41 surrounding a quadrant-guide 42 connected with the arm 1,s:47,o77- I 3 open'or closedias may be desired. This hand jacent ;the periphery of the wrist member may beput to many: uses which it willrnot half way around, said member; two'cable be necessaryhere to described. i guides located at the wrist end ofthe tore- In somecases it may 'not be desirable to arm member close together and close to the e" the handrotate at thewristevery'time periphery ,ot' said member; a (ilouble cable 70 the elbow isbent. I therefore providejmeans the parts of which pass through the guides wh-ereby the;pulley 8 may be released from through the groove aforesaid' and are conits tixed'rel'ationship to the'iipper'arm memnee-ted to the wrist member at opposite sides ber) whenever desired.'--For this purp'osel thereof; an upper arm member ointed to 10 el o ngatethe pivot of the hingejomt and t'hetore arm member; and apulley, secured 75 p rovide' 'a platef45 "longitudinally-mouable' to the upper arm member concentric with on the pivot; 'l hislpla'te has-one o'rf'more ther pivot-oi the joint, 'aroundwhich pulley pins; 46 Is ecured t-hereto adapted ''to' enter the, :ahle. passes and tovhichit secured. pairs of holes I The combinat on of a ,t'ore-arm mem Iholes' in; the gpulley 8. f' T-wo I5 areIproViddJQne p air j'l extends fall'the-. her;anvristmember secured jtothe fore- 8d throughithe pulley and theother pair arm member with, a swivol joint and" hav- .48 -onl y half way through. 'Hol'es'fldd are" mg1zgroores-termed longitudinally in its pro oint member"oftlie'upper surface at opposite sides thereot'extendmg arm intdwhicli'the pins 4'6 may'p'roject after up from theend adjacent the wr ist mempassingjthrough the holes 47; The {pulley her; a hand jointed to bend ,onthe'wrist 85 f-gi's' now lockedtoi the joint memberof the 'memberg-two .cable guides located at, the

' upper; arinl' By -pullingback the plate and wrist end at the fore-ariamember closeto r -en mg the pins in t eholes"- t8, the pull ether-and close .to a e hery 'oi said is freed J from, tlife,,ji lppei' arm member anr 1 nember=-;La double cable the parts of which has no 'op'e 'a'tiv'e'etiect oi'i the cablefl when 'passi'througlrthe guidescrossfl tol and up 90 It sho normal. position.

' specification.

ed omtheuppera ring th'e grooves aforesaidto the, andtofoppogangs headoii"the"piv 'iter'si-des of-"arhich their ends are secured;

v tends to 1101mm "faiiupp'er. arm member jointed, tp the fore- W the holesmitn \vhiclathe-y ma-v be armmember; anda pulley secured to the ed; @Erefrably finger grips 514mg upper-armmember concentric jwiththepivot .95

.providedbnt e plate}tof eilimtgiits' v 'ofi the joint around whiclrpulley the cable ment'or'to} 'e thc operato1-f a*b'etter grip passcs-and to which iti secured P --when :he de es toprelease the pull ey' as The combination of a fore-arm memdescigihedf -'ber-;awrist member secured to ithfe f ore-arm rewri e rieoii springffil is member with a swivel joint having a groove 1e ratcliet' rod ZSivhii-h en- .formed in the end adjacent. the tore-arm allow ember, said groove-extending adjacent the journal 13. This spring tends-to; N periphery ot thev \\'1'1Stmembe1 l alf-way 3 springs inretmrmng the tir'ige'rwt their "around sa'ulwmember andnhavmg {grooves f i thei'forearm i. coil spring 5( e pla cod; ahon kfill roinr the gabove description. it will be po'sito sides thereof-extendingup from the I seen that l have devised simple and effective *giOove in the end adj acent h e wrist memmeans for carryingout the objects of my her; a hand jointed to bend on thevvrist invention as set out in the preamble to this member; two cable guides located at the wrist. end of the fore-arm me her close to- \Vhat I- claim as mv invention is: get'her and close to the periphery of Said 1. The combination of a "tore-arm memmember; a 'doi1blc cable, the parts of which berg a wrist-membersecured to the forearm pass throuflhthe guides across to and up member with a. swivel joint; two cable the grooves aforesaid to the handto oppoguides located at the wrist end of the foresite sides of which their ends are secured;

' arm member close together and close to the an upper arm member jointed to the foreperiphery of said member: a double cable arm member; and a pulley secured to the the parts of which pass through the guides upper arm member concentric with the pivot and are connected with the wrist member at of the joint, around which pulley the cable 55 opposite sides thereof; an upper ,arm mempasses andto which it is secured. her jointed to the tore-arm member; and a 5. The combination of a fore-arm mempulleysecured to the upper arm member her; a wrist-member secured to the foreconcentric with the pivot of the joint, around arm member with a swivel joint; two cable which pulley the cable passes and to which guides located at the wrist end of the fore- 60 it is secured. a arm member close together and close to the 2. The combination of a fore-arm memperiphery of said member; a double cable her; a wrist member secured to the forethe parts of which pass through the guides arm member with a swivel joint and having and are connected with the wrist member at groove formed in the end adjacent the apposite sides thereof; an upper arm mem- 66 tore-arm member, said groove extending adbcr jointed to the forearm member; and a ,i' o1=me'c1 longitudinally in its surfaceatop- 105- fore-arm, around which pulley the cable passes and to which it is secured; and releasable means for locking the pulley to the upper-arm member.

6. The combination of a wrist-member; a

hand-member jointed to bend on the Wristmember; fingers jointed on the hand-member; means operable by a pull to flex the fingers in one direction; spring means tending to flex the fingers in the opposite direction; a flexible member connected with the finger flexing means; a ratchet rack extending longitudinally through the wrist member and to which said flexible member is connected; and a spring actuated dog within ihe wrist member engaging said ratchet rac v 7. The combination of a fore-arm member; a wrist member; a hollow journal forming a swivel joint between the two memhere; a hand-member jointed to bend on the wrist-member; fingers jointed on the hand-' member; means operable by a pull to flex the fingers in one direction; spring means tending to flex the fingers in the opposite direction; a flexible member connected wlth the finger flexing means; a ratchet rack of circular" section extending longitudinally through the hollow journal of the Wrist member and to which said flexible member is connected; and'a spring actuated dog within the wrist member engaging said ratchet rack.

' 8. The combination of a wrist-membema hand-member jointed to bend on the wristmember; fingers jointed on the hand-member; cables for flexing said fingers; a head suitably guided with n the hand to which said cables are connected; a flexible member connected with said head; a ratchet rack extending longitudinally through the wrist-' member and to which said flexible member is connected; and a spring actuated dog rollers around which said cables pass; a

head suitably guided within the hand to which saidcables are-connected; a flexible member connected with said head; a ratchet rack extending longitudinally through the wrist-member and. to which said flexible member is connected; and a spring actuated dog within the wrist-member engaging said ratchet rack.

10. The combination of a wrist-member; a hand-member jointed to bend on the wrist-member; fingers jointed on the handmember; means-operable by a pull to flex the fingers in one direction; spring means tending to'fiex thefingers in the opposite direction; a flexible member connected with the finger flexing means; a ratchet rack extending longitudinally through the Wrist member and to which said flexible member is connected; a spring actuated dog within the Wrist member engaging said ratchet rack; a cable adapted to retract said dog extending through suitable guides; a trip lever fulcrumed on the side of the upper-arm adapted to draw on said cable when pressed toward the upper-arm member; and a spring tending to maintain the lever in normal position.

Signed at Toronto, Can, this 5th'day of March, 1917.- a

LOUIS G. CARON. I 

